Ethyleneimine hydrotetrafluoroborate

Step 2 5-(p-Chlorophenyll-5-Hydroxy-2,3-Dihydro-5H-lmidazo[2,1 -a]Isoindole 1-(p-Chlorophenyl)-3-ethoxy-1 H-isoindole (1 g), 2 g of ethyleneimine hydrotetrafluoroborate moistened with methylene chloride (containing approximately 0.66 g of dry salt) is refluxed in 25 ml of absolute toluene for 2 hours in an atmosphere of nitrogen. The result-... 

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